A star fort or trace italienne is a type of military fortification first introduced in Italy around the mid-fifteenth century. Traditional medieval castles, towers and ring forts had proved extremely vulnerable to increasingly mobile cannons, and star forts were introduced specifically to better defend against them. The tiny Italian town of Palmanova was founded in 1593, and using all the military innovations of the 16th century was built in the shape of nine-pointed star. You can still see quite clearly how the shape of the ramparts allows the points of the star to defend each other. Originally a…